複数流路モデルを用いた葛根田地熱地域におけるトレーサー試験結果の解析

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  • Analysis of Tracer Test Performed in the Kakkonda Geothermal Field with Multi-flowpath Model
  • フクスウ リュウロ モデル オ モチイタ カッコンダ チネツ チイキ ニ オケル トレーサー シケン ケッカ ノ カイセキ

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For analysis of the hydrological connectivity between production and reinjection wells in the Kakkonda geothermal field, tracer tests were performed in 2002. In the tracer test, two different types of tracer were injected at respective reinjection well-116 and 136, and tracer return was examined by repeated sampling of water at 26 production wells. The results were analyzed with the multi-flowpath model to evaluate the magnitude of hydrological connectivity among the wells used in the tracer test, and to understand the flow behavior of reinjected water. Satisfactory results were obtained with a two-flowpath model for most production wells. Comparison of fluid velocities in each flowpath and the directions between the main feed points of production and reinjection wells indicated a possibility that some production wells are hydrologicaly connected to each other through the same fracture system. Tracer return are divided into two groups on the basis of mean-arrival-time, and amount of reinjected water return to production zone is appreciable for those with longer arrival time.

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